Valve-grinding tool.



UTTE

JOSEPH J. RISGHARD, OF PASADENA, CALIFORNIA.

VALVE-GRINDING TOOL.

Application filed January 9, 1918.

To all whom it may concern:

Be it known that I, Josrtrrr J. RisonAnn, a citizen of the United States, residing at Pasadena, in the county of Los Angeles and State of California, have invented new and useful Improvements in Valve-Grinding Tools, of which the following is a specification. I

My object is to make a tool for use in regrinding the valves of a gas engine, the tool being constructed to grip the valve and there being a joint in the handle so that reasonable vibration of the handle will not loosen the grip.

Figure 1 is a view illustrating the use of a valve grinding tool embodying the principles of my invention, the head of the engine being shown in section and broken away and the tool being shown in elevation and connected to the valve.

Fig. 2 is an enlarged detail view analogous to Fig. 1.

Fig. 3 is an enlarged sectional detail on the line 33 of Fig. 2.

Fig. 4 is a sectional detail on the line 4c1 of Fig. 2.

Fig. 5 is a view analogous to Fig. 2 and showing a modified construction of the tool.

Fig. 6 is a fragmentary side elevation as seen looking in the direction indicated by the arrow 6 in Fig. 5.

Fig. 7 is an enlarged cross-sectional detail on the line 77 of Fig. 5.

Fig. 8 is an enlarged edge view looking in the direction indicated by the arrow 8 in Fig. 6.

The handle 1 is rigidly secured to a square stem 2 having parallel transverse openings 3 and 4 near its lower end. The gripping jaws 5 and 6 are made from sections of the same square material as the stem 2 and said jaws have openings 7 and 8 in their upper ends through which a cotter pin 9 is inserted, said cotter pin also passing through the opening 3 to pivotally connect the jaws to the stem, the openings 7 and 8 being large enough to allow the lower ends of the jaws to swing to and from the lower end of the stem. A wing headed screw 10 is screwseated through the lower end of the jaw 6 and passes loosely through the opening 4 into the socket opening 11 formed from the inner face of the jaw 5, so that when the screw 10 is operated to screw inwardly the lower ends of the jaws o and 6 are pressed apart Specification of Letters Patent.

Patented July 2, 1918.

Serial No. 211,045.

and so that when the operation of the screw is reversed the jaws may come toward each other and against the sides of the stem 2. The lower ends of the jaws 5 and 6 extend below the lower end of the stem 2 and said lower ends are turned to produce the necks 12 and 13 and the gripping teeth let and 15 upon the extreme lower ends of the necks.

In the use of this tool the plug is removed from the opening 16 in the head 17 of the engine and the tool is inserted downwardly through the opening 16 to engage the valve 18. The necks l2 and 13 extend downwardly into the spanner recesses or key sockets 19 and 20 formed from the upper face of the valve 18, so that the lower faces ofthe teeth 14 and 15 engage the bottoms of the recesses. Then the screw 10 is operated to throw the jaws 5 and 6 apart, thereby forcing the teeth 1% and 15 to cut into the metal at the sides of the recesses. This will cause the tool to grip the valve and as the handle 1 is rotated by rubbing the two hands of the operator in opposite directions against the handle, the valve 18 will be rotated to grind itself into its seat. The lower end of the stem 2 may vibrate between the jaws 5 and 6, thus allowing for the vibration of the handle 1 between the hands of the operator and reducing the liability of loosening the grip of the tool upon the valve. When the grinding operation is complete the screw 10 is loosened and the tool withdrawn.

In the modification shown in Figs. 58 the valve 21 is manufactured with a transverse slot 22 extending from its upper face, and the tool is constructed to grip in this slot instead of gripping in spanner recesses, as in Fig. 2. The handle 23 is rigidly secured to the upper end of the stem 24% and a bifurcated bearing 25 is formed upon the lower end of the stem 24. The jaws 26 and 27 are fiat and their heads 28 and 29 fit close together and fit in the bifurcation 30 of the bearing 25, and a pivot bolt 31 is inserted through the bearing and through the heads to form a pivotal connection between the stem 24L and the jaws 26 and 27. The jaws 26 and 27 normally fit flat together, and a' wing headed set-screw 82 is screw-seated through the jaw 27 against the jaw 26, so that it may be screwed inwardly to spread the lower ends of the jaws apart. The jaws 26 and 27 are notched from their end faces to form the necks 83, 34, 35 and 36, the necks 33 and 35 being staggered to be opposite the notches which form the necks 34 and 36, and said necks 33 and 35 are off-set inwardly half the thickness of the metal, and the necks 34k and 36 are off-set inwardly half the thickness of the metal, so that when the screw 32 isbacked out and the jaws 26 and 27 come fiat together the necks 33, 34, 35 and 36 are in a line to pass into the slot 22 and down to the bottom of the slot. Sharp teeth 37 project outwardly from the lower ends of the necks 33 and 35, and corresponding sharp teeth 38 project outwardly from the lower ends of the necks 34 and 35, so that when the screw 32 is operated to press the jaws 26 and 27 apart the teeth 37 and 38 will cut into the metal at the sides of the slot 22 and grip the tool to the valve. The pivot joint formed by the bolt 31 allows for the vibration of the handle 23 in the operation, and when the grinding operation has been completed the screw 32 is loosened and the tool withdrawn.

While I have shown the preferred construction of my Valve grinding tool, it will be understood by those skilled in the art that various changes in the construction, combination and arrangement of parts may be made, without departing from the spirit of my invention as claimed.

I claim: I

A valve grinding tool comprising ahandle, a stem rigidly fixed to the handle, jaws flexibly connected to the stern and having teeth adapted to grip a valve head in its key sockets, and a set-screw carried by one jaw. and engaging the other to force the jaws apart and cause th teeth to grip.

In testimony whereof I have signed my name to this specification.

, JOSEPH J. RISCHARD.

Copies of this'patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

